Saturday, 15th of November 2014 |
Cases of paralysis caused by mutating polio vaccine have been found in South Sudan and Madagascar, the World Health Organization said Friday. New rounds of vaccination will be conducted in December in both areas. The two paralysis cases in South Sudan were in a displaced-persons camp where revaccination is relatively easy, the W.H.O. said, while testing suggests that the one case in Madagascar did not spread far. “Vaccine-derived polio paralysis” is a rare but small risk inherent in oral vaccine, so the polio eradication campaign is trying to introduce injectable vaccine wherever it is safe and practical. The injectable vaccine contains a “killed” virus that cannot mutate. But it provides less protection than the live, weakened virus in oral vaccine, is more expensive and is much harder to give. Only 279 cases of polio have been detected in the world this year, almost all of them in Pakistan or in Pakistani families in Afghanistan.
A version of this brief appears in print on November 15, 2014, on page A7 of the New York edition with the headline: Rare Vaccine-Derived Polio Discovered in 2 Countries.Are three drugs for malaria better than two?
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www.measlesinitiative.org www.technet21.org www.polioeradication.org www.globalhealthlearning.org www.who.int/bulletin allianceformalariaprevention.com www.malariaworld.org http://www.panafrican-med-journal.com/ |